The multiplayer mechanics of Elden Ring make it quite easy to play through nearly the entire game alongside a friend or two, but even setting a password won't stop other players from invading. In fact, those who have been playing a lot of co-op may feel as though they are becoming the target of invasions an inordinate amount. Setting a multiplayer password restricts the pool of available summon signs, but doesn't affect how Elden Ring's PvP invasions work. As long as players are participating in co-op, they are liable to be invaded.
Elden Ring's brand of multiplayer harkens back to 2009's Demon's Souls, but is far more forgiving than early iterations. Being in Human Form in Demon's Souls — or having restored Humanity in Dark Souls — would open the player up to invasions. This mechanic introduces a trade-off where summoning is possible, especially in Demon's Souls where characters in Soul Form have lower maximum hit points. In Elden Ring, this trade-off has been transferred entirely to co-op. Playing co-op in any form will open up the game to invaders, a consequence for the massive boon having a second player can be.
Related: How Elden Ring's Co-Op Could Be Easily Improved
This rule is universal, regardless of whether or not co-op has been initiated through the use of a password. Elden Ring co-op helps with leveling up and fighting particularly tough bosses, but the entire affair comes with an inherent risk of being invaded. This mechanic also means the host will usually be at an advantage with two players against the one. For those frustrated with invasions, there's unfortunately no way to circumvent this, since it's a purposefully designed element of Elden Ring's multiplayer.
Even using a multiplayer password doesn't
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